EP0191398A1 - Oil-filled tap changer assembly with oil expansion vessel - Google Patents

Oil-filled tap changer assembly with oil expansion vessel Download PDF

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Publication number
EP0191398A1
EP0191398A1 EP86101405A EP86101405A EP0191398A1 EP 0191398 A1 EP0191398 A1 EP 0191398A1 EP 86101405 A EP86101405 A EP 86101405A EP 86101405 A EP86101405 A EP 86101405A EP 0191398 A1 EP0191398 A1 EP 0191398A1
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EP
European Patent Office
Prior art keywords
oil
tap changer
expansion vessel
oil expansion
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86101405A
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German (de)
French (fr)
Other versions
EP0191398B1 (en
Inventor
Karl Dipl.-Ing. Stenzel (Fh)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Reinhausen GmbH
Original Assignee
MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & Co KG GmbH
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & Co KG GmbH, Maschinenfabrik Reinhausen GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & Co KG GmbH
Publication of EP0191398A1 publication Critical patent/EP0191398A1/en
Application granted granted Critical
Publication of EP0191398B1 publication Critical patent/EP0191398B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

Definitions

  • the invention relates to an oil-filled built-in step switch according to the preamble of claim 1.
  • step switches are known: DE-AS 25 15 192.
  • an oil expansion tank assigned to the tap changer which is usually connected to the oil expansion tank of the transformer, is provided for this purpose.
  • the required oil flow line from the tap changer to the oil expansion tank then also contains an oil flow relay to prevent gasification of the oil, e.g. excessive shift gas developments.
  • an additional pressure relief device is usually provided in the tap changer head, regardless of the device for oil expansion, which in the event of suddenly occurring excess pressure, e.g. as a result of a short circuit that allows immediate pressure reduction.
  • the object of the invention is to improve the tap changer mentioned at the outset with regard to the oil expansion vessel in such a way that while maintaining the conventional use of oil flow relays and additional pressure relief, the tap changer and oil expansion vessel form a structural unit which can be preassembled in the manufacturing plant and which at the same time can also be retrofitted or equivalent Retrofitting of tap changers already in operation enables.
  • This object is achieved by the means specified in the characterizing part of patent claim 1.
  • the advantages achieved with the invention are, in particular: built-in tap changer and oil expansion vessel form a structural unit which can be produced entirely in the tap changer manufacturer and which no longer requires any additional installation work on the tap changer itself.
  • the oil expansion tank By combining the oil expansion tank with the cover of the tap changer or with the tap changer head and by arranging the oil expansion tank within the contour of the tap changer head, the space requirement for the expansion tank is practically insignificant; because the space above the built-in step switch must always remain free.
  • the oil expansion vessel does not constitute a hindrance for the pressure relief device, which is usually present in the cover of the tap changer head. Rather, it is an integral part of the oil expansion vessel in that the pressure relief connector of the tap changer head continues directly as a separate channel in the expansion tank.
  • This channel is advantageously designed as a tube penetrating the oil expansion vessel.
  • the oil flow containing the oil flow relay connected to this pipe The line is expediently provided with a slight slope, so that the switching gases entering the oil flow line can flow away to the oil expansion volume. It is also advantageous if the oil flow line containing the oil flow relay is arranged to the side of the actual oil expansion vessel, but within the contour of the tap changer head. You and in particular the oil flow relay are then accessible in the usual way.
  • the head 1 of the tap changer is provided with a flange 2 which can be placed on a corresponding flange of the installation opening in the transformer.
  • the tap changer head has a cover 3 on which there is a gear stage 4 for driving the tap changer and which also carries a short pipe socket 5.
  • the actual oil expansion vessel 7 is flanged onto an upper flange 6 of this pipe socket. As can be seen in FIG. 2, this oil expansion vessel 7 lies within the contour (flange 2) of the tap changer head 1, covering approximately a segment surface of the tap changer head.
  • the pipe socket 5 seated on the cover 3 continues in the interior of the oil expansion tank 7 by providing a pipe 8 which penetrates the oil expansion tank from bottom to top.
  • This tube 8 carries on its outer flange 13 a special pressure relief valve 9.
  • this Pressure relief valve also another device for pressure relief, such as a rupture plate, can be provided.
  • an oil flow line 11 is connected to the pipe 8, which contains an oil flow relay 12 and which opens into the actual expansion volume of the oil expansion vessel 7.
  • Oil flow line 11 and oil flow relay 12 are also within the contour of the tap changer head, above the segment surface of the tap changer head left free by the oil expansion vessel 7.
  • An oil level indicator 14 then sits on the side surface of the oil expansion vessel 7.
  • a special dehumidifier 16 is additionally provided on the oil expansion vessel 7.

Abstract

1. Oil-filled built-in tap switch with separately arranged individual oil expansion vessel, characterized thereby, that the oil expansion vessel (7) corresponds approximately to the outline (2) of the tap switch head (1), is arranged above the tap switch head and connected with the tap switch head by means of a short pipe stub (5), that the pipe stub (5) opens into an upwardly extending channel (8) of the oil expansion vessel (7), wherein the channel (8) displays about the same cross-section as the pipe stub and is closed outwardly by means of a pressure relief equipment (9) at its upper end, and that a substantially horizontally extending oil flow duct (11), which contains an oil flow relay (12) and opens into the actual oil expansion volume of the expansion vessel (7), is connected to the channel (8) below the minimum oil level (10) of the oil expansion vessel (7).

Description

Die Erfindung bezieht sich auf einen ölgefüllten Einbaustufenschalter gemäß Oberbegriff des Patentanspruches 1. Derartige Stufehschalter sind bekannt: DE-AS 25 15 192.The invention relates to an oil-filled built-in step switch according to the preamble of claim 1. Such step switches are known: DE-AS 25 15 192.

Bei ölgefüllten Stufenschaltern besteht die Notwendigkeit, ein spezielles Volumen für die infolge Temperaturschwankungen auftretende Ölausdehnung vorzusehen. Üblicherweise wird hierfür ein dem Stufenschalter zugeordnetes Ölausdehnungsgefäß, welches zumeist mit dem Ölausdehnungsgefäß des Transformators verbunden ist, vorgesehen. Die hierbei erforderliche Ölströmungsleitung vom Stufenschalter zum Ölausdehnungsgefäß enthält dann ferner ein Ölströmungsrelais, um Vergasun- gen des Öls, wie z.B. übermäßige Schaltgasentwicklungen, erfassen zu können. Darüberhinaus wird üblicherweise im Stufenschalterkopf, und zwar unabhängig von der Vorrichtung zur Ölausdehnung, eine zusätzliche Druckentlastungseinrichtung vorgesehen, die bei plötzlich auftretendem Überdruck, z.B. infolge eines Kurzschlusses, den sofortigen Druckabbau zuläßt.With oil-filled tap changers, there is a need to provide a special volume for the oil expansion that occurs as a result of temperature fluctuations. Usually, an oil expansion tank assigned to the tap changer, which is usually connected to the oil expansion tank of the transformer, is provided for this purpose. The required oil flow line from the tap changer to the oil expansion tank then also contains an oil flow relay to prevent gasification of the oil, e.g. excessive shift gas developments. In addition, an additional pressure relief device is usually provided in the tap changer head, regardless of the device for oil expansion, which in the event of suddenly occurring excess pressure, e.g. as a result of a short circuit that allows immediate pressure reduction.

Bei den genannten Stufenschaltern wird es in vielen Fällen als umständlich angesehen, daß die besagte Möglichkeit zur Ölausdehnung nicht unmittelbarer Bestandteil des Stufenschalters ist und eine Installation derselben erst nach Aufstellung des Stufentransformators vorgenommen werden kann. Zwar ist es bekannt, das für den Stufenschalter erforderliche Ölausdehnungsvolumen unmittelbar im Stufenschalterkopf als eigene Kammer vorzusehen (DE-GM 74 37 447), jedoch ergeben sich dann Schwierigkeiten für die Anbringung des Ölströmungsrelais sowie für die Anordnung einer Druckentlastungseinrichtung. Auch ist es natürlich kaum möglich, bereits in Betrieb befindliche Stufenschalter auf diese Art umzurüsten.In the case of the step switches mentioned, it is considered cumbersome in many cases that the said possibility of oil expansion is not a direct component of the step switch and that the same can only be installed after the step transformer has been installed. Although it is known to provide the oil expansion volume required for the tap changer directly in the tap changer head as a separate chamber (DE-GM 74 37 447), difficulties then arise for the attachment of the oil flow relay and for the arrangement of a pressure relief device direction. Of course, it is also hardly possible to convert the tap changer that is already in operation in this way.

Aufgabe der Erfindung ist es, den eingangs genannten Stufenschalter bezüglich des Ölausdehnungsgefäßes so zu verbessern, daß bei Beibehaltung des herkömmlichen Einsatzes von Ölströmungerelais und zusätzlicher Druckentlastung Stufenschalter und Ölausdehnungsgefäß eine bauliche Einheit bilden, die im Herstellerwerk vormontiert werden kann und die zugleich auch ein Nachrüsten oder entsprechendes Umrüsten bereits in Betrieb befindlicher Stufenschalter ermöglicht. Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruches 1 angegebene Mittel gelöst.The object of the invention is to improve the tap changer mentioned at the outset with regard to the oil expansion vessel in such a way that while maintaining the conventional use of oil flow relays and additional pressure relief, the tap changer and oil expansion vessel form a structural unit which can be preassembled in the manufacturing plant and which at the same time can also be retrofitted or equivalent Retrofitting of tap changers already in operation enables. This object is achieved by the means specified in the characterizing part of patent claim 1.

Die mit der Erfindung erzielten Vorteile sind insbesondere: Einbaustufenschalter und Ölausdehnungsgefäß bilden eine konstruktive Einheit, die vollständig im Herstellerwerk des Stufenschalters hergestellt werden kann und die keine zusätzlichen Installationsarbeiten am Stufentransformator selbst mehr erfordert. Durch die Kombination des Ölausdehnungsgefäßes mit dem Deckel des Stufenschalters bzw. mit dem Stufenschalterkopf und durch das Anordnen des Ölausdehnungsgefäßes innerhalb der Kontur des Stufenschalterkopfes fällt der Platzbedarf für das Ausdehnungsgefäß praktisch nicht ins Gewicht; denn der Platz oberhalb des Einbaustufenschalters muß in jedem Fall frei bleiben. Auch stellt das Ölausdehnungsgefäß keine Behinderung für die Druckentlastungseinrichtung, die üblicherweise im Deckel des Stufenschalterkopfes vorhanden ist, dar. Sie ist vielmehr integrierter Bestandteil des Ölausdehnungsgefäßes, indem sich der Druckentlastungsstutzen des Stufenschalterkopfes unmittelbar als eigener Kanal im Ulausdehnungsgefäß fortsetzt. In vorteilhafter Weise wird dieser Kanal als ein das Ölausdehnungsgefäß durchdringendes Rohr ausgebildet. Die an diesem Rohr angeschlossene das Ölströmungsrelais enthaltende Ölströmungsleitung wird zweckmäßig mit einem leichten Gefälle versehen, so daß die in die Ölströmungsleitung eintretenden Schaltgase auf jeden Fall zum Ölausdehnungsvolumen hin abfließen können. Es ist ferner vorteilhaft, wenn die das Ölströmungsrelais enthaltende Ölströmungsleitung seitlich vom eigentlichen Ölausdehnungsgefäß, aber innerhalb der Kontur des Stufenschalterkopfes angeordnet wird. Sie und insbesondere das Ölströmungsrelais sind dann auf übliche Art zugänglich.The advantages achieved with the invention are, in particular: built-in tap changer and oil expansion vessel form a structural unit which can be produced entirely in the tap changer manufacturer and which no longer requires any additional installation work on the tap changer itself. By combining the oil expansion tank with the cover of the tap changer or with the tap changer head and by arranging the oil expansion tank within the contour of the tap changer head, the space requirement for the expansion tank is practically insignificant; because the space above the built-in step switch must always remain free. The oil expansion vessel does not constitute a hindrance for the pressure relief device, which is usually present in the cover of the tap changer head. Rather, it is an integral part of the oil expansion vessel in that the pressure relief connector of the tap changer head continues directly as a separate channel in the expansion tank. This channel is advantageously designed as a tube penetrating the oil expansion vessel. The oil flow containing the oil flow relay connected to this pipe The line is expediently provided with a slight slope, so that the switching gases entering the oil flow line can flow away to the oil expansion volume. It is also advantageous if the oil flow line containing the oil flow relay is arranged to the side of the actual oil expansion vessel, but within the contour of the tap changer head. You and in particular the oil flow relay are then accessible in the usual way.

Ein Ausführungsbeispiel der Erfindung ist ausschnittsweise in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen

  • Figur 1 eine Seitenansicht des Stufenschalterkopfes mit Ausdehnungsgefäß und
  • Figur 2 eine Draufsicht gemäß Figur 1.
An embodiment of the invention is shown in detail in the drawing and is described in more detail below. Show it
  • Figure 1 is a side view of the tap changer head with expansion tank and
  • FIG. 2 shows a top view according to FIG. 1.

Wie ersichtlich, ist der Kopf 1 des im einzelnen nicht näher dargestellten Stufenschalters mit einem Flansch 2 versehen, der auf einen entsprechenden Flansch der Einbauöffnung im Transformator aufsetzbar ist. Der Stufenschalterkopf besitzt einen Deckel 3 auf dem eine Getriebestufe 4 für den Antrieb des Stufenschalters vorhanden ist und der ferner einen kurzen Rohrstutzen 5 trägt. Auf einem oberen Flansch 6 dieses Rohrstutzens ist das eigentliche Ölausdehungsgefäß 7 aufgeflanscht. Dieses Ölausdehnungsgefäß 7 liegt, wie aus Figur 2 ersichtlich, innerhalb der Kontur (Flansch 2) des Stufenschalterkopfes 1, wobei es etwa eine Segmentfläche des Stufenschalterkopfes überdeckt. Der am Deckel 3 sitzende Rohrstutzen 5 setzt sich im Innern des Ölausdehnungsgefäßes 7 fort, indem dort ein das Ölausdehnungsgefäß von unten nach oben durchdringendes Rohr 8 vorgesehen ist. Dieses Rohr 8 trägt an seinem äußeren Flansch 13 ein spezielles Druckentlastungsventil 9. Selbstverständlich kann anstelle dieses Druckentlastungsventils auch eine andere Einrichtung zur Druckentlastung, z.B. eine Berstplatte, vorgesehen werden. Unterhalb des kleinst möglichen Ölpegels 10 ist an dem Rohr 8 eine Ölströmungsleitung 11 angeschlossen, die ein Ölströmungsrelais 12 enthält und die in das eigentliche Ausdehnungsvolumen des Ölausdehnungsgefäßes 7 einmündet. Ölströmungsleitung 11 und Ölströmungsrelais 12 liegen dabei ebenfalls innerhalb der Kontur des Stufenschalterkopfes, und zwar oberhalb der vom Ölausdehnungsgefäß 7 freigelassenen Segmentfläche des Stufenschalterkopfes. An der Seitenfläche des Ölausdehnungsgefäßes 7 sitzt dann noch ein Ölstandanzeiger 14. Ferner ist zusätzlich am Ölausdehnungsgefäß 7 ein spezieller Luftentfeuchter 16 vorgesehen. Die am Stufenschalterkopf 1 noch erkennbaren Rohranschlußflansche 15 dienen der Ölfüllung bzw. Ölabsaugung des Stufenschalters.As can be seen, the head 1 of the tap changer, not shown in detail, is provided with a flange 2 which can be placed on a corresponding flange of the installation opening in the transformer. The tap changer head has a cover 3 on which there is a gear stage 4 for driving the tap changer and which also carries a short pipe socket 5. The actual oil expansion vessel 7 is flanged onto an upper flange 6 of this pipe socket. As can be seen in FIG. 2, this oil expansion vessel 7 lies within the contour (flange 2) of the tap changer head 1, covering approximately a segment surface of the tap changer head. The pipe socket 5 seated on the cover 3 continues in the interior of the oil expansion tank 7 by providing a pipe 8 which penetrates the oil expansion tank from bottom to top. This tube 8 carries on its outer flange 13 a special pressure relief valve 9. Of course, instead of this Pressure relief valve also another device for pressure relief, such as a rupture plate, can be provided. Below the smallest possible oil level 10, an oil flow line 11 is connected to the pipe 8, which contains an oil flow relay 12 and which opens into the actual expansion volume of the oil expansion vessel 7. Oil flow line 11 and oil flow relay 12 are also within the contour of the tap changer head, above the segment surface of the tap changer head left free by the oil expansion vessel 7. An oil level indicator 14 then sits on the side surface of the oil expansion vessel 7. Furthermore, a special dehumidifier 16 is additionally provided on the oil expansion vessel 7. The pipe connection flanges 15, which can still be seen on the tap changer head 1, serve to fill or drain the tap changer.

Claims (4)

1. Ölgefüllter Einbaustufenschalter mit eigenem separat angeordneten Ölausdehnungsgefäß,
dadurch gekennzeichnet,
daß das etwa der Kontur (2) des Stufenschalterkopfes (1) entsprechende Ölausdehnungsgefäß (7) oberhalb des Stufenschalterkopfes angeordnet und mittels eines kurzen Rohrstutzens (5) mit dem Stufenschalterkopf verbunden ist, daß der Rohrstutzen (5) in einen von unten nach oben verlaufenden Kanal (8) des Ölausdehnungsgefäßes (7) einmündet, wobei der Kanal (8) etwa den gleichen Querschnitt wie der Rohrstutzen aufweist und an seinem oberen Ende nach außen mittels einer Druckentlastungseinrichtung (9) verschlossen ist, und daß unterhalb des minimalen Ölpegels (10) des Ölausdehnungsgefäßes (7) am Kanal (8) eine im wesentlichen waagerecht verlaufe'nde ein Ölströmungsrelais (12) enthaltende Ölströmungsleitung (11) angeschlossen ist, die in das eigentliche Ölausdehnungsvolumen des Ausdehnungsgefäßes (7) einmündet.1.Oil-filled built-in level switch with its own separately arranged oil expansion tank,
characterized,
that the roughly the contour (2) of the tap changer head (1) corresponding oil expansion tank (7) is arranged above the tap changer head and connected by means of a short pipe socket (5) to the tap changer head, that the pipe socket (5) in a channel running from bottom to top (8) of the oil expansion vessel (7) opens, the channel (8) having approximately the same cross-section as the pipe socket and at its upper end is closed to the outside by means of a pressure relief device (9), and that below the minimum oil level (10) Oil expansion vessel (7) to the channel (8) is connected to an essentially horizontal oil flow line (11) containing an oil flow relay (12), which opens into the actual oil expansion volume of the expansion vessel (7). 2. Einbaustufenschalter nach Anspruch 1,
dadurch gekennzeichnet,
daß der Kanal als ein das Ölausdehnungsgefäß durchdringendes Rohr (8) ausgebildet ist.2. built-in step switch according to claim 1,
characterized,
that the channel is designed as a tube (8) penetrating the oil expansion vessel. 3. Einbaustufenschalter nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Ölströmungsleitung (11) ein vom Ausdehnungsvolumen (13) zum Volumen des Stufenschalters (1) verlaufendes minimales Gefälle besitzt.3. built-in step switch according to claim 1 or 2,
characterized,
that the oil flow line (11) has a minimum gradient extending from the expansion volume (13) to the volume of the tap changer (1). 4. Einbaustufenschalter nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet,
daß das Ölausdehnungsgefäß (7)eine Segmentfläche des Stufenschalterkopfes (1) überdeckt und daß Ölströmungsleitung (11) und Ölströmungsrelais (12) außerhalb des Ölausdehnungsgefäßes oberhalb der vom Ölausdehnungsgefäß nicht belegten Fläche des Stufenschalterkopfes angeordnet sind.4. built-in step switch according to claim 1, 2 or 3,
characterized,
that the oil expansion tank (7) covers a segment surface of the tap changer head (1) and that the oil flow line (11) and oil flow relay (12) are arranged outside the oil expansion tank above the surface of the tap changer head not occupied by the oil expansion tank.
EP86101405A 1985-02-13 1986-02-04 Oil-filled tap changer assembly with oil expansion vessel Expired EP0191398B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3504916 1985-02-13
DE19853504916 DE3504916A1 (en) 1985-02-13 1985-02-13 OIL-FILLED INSTALLATION SWITCH WITH OIL EXPANSION VESSEL

Publications (2)

Publication Number Publication Date
EP0191398A1 true EP0191398A1 (en) 1986-08-20
EP0191398B1 EP0191398B1 (en) 1989-05-03

Family

ID=6262422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101405A Expired EP0191398B1 (en) 1985-02-13 1986-02-04 Oil-filled tap changer assembly with oil expansion vessel

Country Status (3)

Country Link
EP (1) EP0191398B1 (en)
JP (1) JPH0656817B2 (en)
DE (2) DE3504916A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1001422B (en) * 1991-10-21 1993-11-30 Vasileios Savvopoulos Device for the automatic protection of the environment
CN103314423A (en) * 2011-01-15 2013-09-18 赖茵豪森机械制造公司 Tap changer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10224074B4 (en) * 2002-05-31 2011-02-03 Maschinenfabrik Reinhausen Gmbh step switch
DE102005031359B3 (en) * 2005-06-30 2007-01-25 Siemens Ag step switch
DE102016110221A1 (en) 2016-06-02 2017-12-07 Maschinenfabrik Reinhausen Gmbh On-load tap-changer head and on-load tap-changer with on-load tap-changer head

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1262438B (en) * 1963-08-19 1968-03-07 Shinji Nakazawa Expansion tank for oil transformers
DE2515192B2 (en) * 1975-04-08 1978-02-02 Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg STEP-BY-STEP TRANSFORMER WITH PRESSURE EQUALIZATION BETWEEN SEPARATE OIL ROOMS
EP0150132A2 (en) * 1984-01-24 1985-07-31 Mitsubishi Denki Kabushiki Kaisha On-load tap changer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1793820A (en) * 1924-11-19 1931-02-24 Allis Chalmers Mfg Co Transformer or the like
DE7437447U (en) * 1974-11-09 1976-05-13 Maschinenfabrik Reinhausen Gebrueder Scheubeck Kg, 8400 Regensburg TAP SWITCH WITH EXPANSION VESSEL ARRANGED IN AN OIL VESSEL

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1262438B (en) * 1963-08-19 1968-03-07 Shinji Nakazawa Expansion tank for oil transformers
DE2515192B2 (en) * 1975-04-08 1978-02-02 Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg STEP-BY-STEP TRANSFORMER WITH PRESSURE EQUALIZATION BETWEEN SEPARATE OIL ROOMS
EP0150132A2 (en) * 1984-01-24 1985-07-31 Mitsubishi Denki Kabushiki Kaisha On-load tap changer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1001422B (en) * 1991-10-21 1993-11-30 Vasileios Savvopoulos Device for the automatic protection of the environment
CN103314423A (en) * 2011-01-15 2013-09-18 赖茵豪森机械制造公司 Tap changer

Also Published As

Publication number Publication date
JPH0656817B2 (en) 1994-07-27
DE3504916A1 (en) 1986-08-14
DE3504916C2 (en) 1987-03-19
EP0191398B1 (en) 1989-05-03
DE3663210D1 (en) 1989-06-08
JPS61187313A (en) 1986-08-21

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